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Regulatory Matters - Retail Rate Case Filing (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2023 USD ($) $ / kWh | Jul. 12, 2023 USD ($) $ / kWh | Jul. 11, 2023 $ / kWh | Jun. 14, 2023 USD ($) | Oct. 28, 2022 USD ($) $ / kWh | Jun. 30, 2022 USD ($) | Dec. 17, 2021 USD ($) | Oct. 27, 2021 USD ($) | Aug. 02, 2021 USD ($) | Mar. 27, 2017 USD ($) | Sep. 30, 2023 USD ($) | Aug. 04, 2023 USD ($) | Aug. 03, 2023 USD ($) | Jun. 15, 2023 USD ($) | Jun. 05, 2023 | Mar. 06, 2023 | Nov. 30, 2022 USD ($) | Apr. 30, 2022 USD ($)
ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue increase (decrease) | $ 281,900 | $ 383,100 |  |  |  |  |  |  |  |  |  |  |  | $ 251,000 |  |  |  |
Alternative revenue increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 312,000 |  |  |  |
Recommended return on equity, percentage | 9.68% | 10.25% |  |  |  |  |  |  |  |  |  |  |  | 9.60% |  |  |  |
Increment of fair value rate, percentage | 0.50% | 0.50% |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |
Alternative increment of fair value rate percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0075 |  |  |  |
Hypothetical capital structure of equity layer percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.46 |  |  |
Base fuel rate (in dollars per kWh) | $ / kWh | 0.006 | 0.006 | 0.004 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACC | Navajo Nation, Hopi Tribe | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recoverable through rates related to the CCT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000
ACC | Navajo Nation | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recoverable through rates related to the CCT |  |  |  |  |  |  |  |  |  |  | $ 6,660 |  |  |  |  |  |  |
ACC | Navajo Nation, Hopi Reservation | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recoverable through rates related to the CCT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250
ACC | Navajo County Communities | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount recoverable through rates related to the CCT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500
ACC | Navajo Nation, Electrification Projects | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000
ACC | Navajo County Communities, CCT and Economic Development | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100
ACC | Navajo Nation, Hopi Tribe for CCT and Economic Development | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250
ACC | Navajo and Hopi Tribes | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disbursement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250 |
ACC | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue deficiency |  |  |  |  | $ 772,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue increase (decrease) |  |  |  |  |  |  |  |  |  |  |  | $ 377,700 | $ 383,100 |  |  |  |  |
Regulatory matters, customer bill impact rate |  | 11.30% |  |  |  |  |  |  |  |  |  | 11.20% |  |  |  |  |  |
Regulatory matters, no of basis penalty point |  |  |  |  |  |  | 0.0020 | 0.0020 |  |  |  |  |  |  |  | 20 |  |
Reversal of basis point penalty |  |  |  | 0.0020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate percentage of increase in average residential customer bill |  |  |  |  | 13.60% |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matter, cost base rate |  |  |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Revenue increase (decrease) |  |  |  |  |  |  |  |  | $ (111,000) |  |  |  |  |  |  |  |  |
Recommended return on equity, percentage |  |  |  |  |  |  | 8.90% | 8.70% | 9.16% |  |  |  |  |  |  |  |  |
Increment of fair value rate, percentage |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |
Base fuel rate (in dollars per kWh) | $ / kWh |  |  |  |  | 0.038321 |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction on equity percentage |  |  |  |  |  |  |  |  | 0.03% |  |  |  |  |  |  |  |  |
Effective fair value percentage |  |  |  |  |  |  |  |  | 4.95% |  |  |  |  |  |  |  |  |
Net retail base rate, increase |  |  |  |  |  |  |  |  |  | $ 94,600 |  |  |  |  |  |  |  |
Non-fuel and non-depreciation base rate, increase |  |  |  |  |  |  |  |  |  | 87,200 |  |  |  |  |  |  |  |
Fuel-related base rate decrease |  |  |  |  |  |  |  |  |  | 53,600 |  |  |  |  |  |  |  |
Base rate increase, changes in depreciation schedules |  |  |  |  |  |  |  |  |  | $ 61,000 |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Economic Development Organization | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disallowance of annual amortization percentage |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Amount funded by customers |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |
Amount funded by customers, term |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo County Communities | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  | $ 500 | $ 5,000 |  |  |  |  |  |  |  |  |
Amount funded by shareholders, term |  |  |  |  |  |  |  | 60 days | 5 years |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Hopi Tribe | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  | $ 1,000 | $ 1,675 |  |  |  |  |  |  |  |  |
Amount funded by shareholders, term |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |
Amount not recoverable |  |  |  |  |  |  |  | $ 215,500 |  |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders, term |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation, Hopi Reservation | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |
ACC | APS | Retail Rate Case Filing with Arizona Corporation Commission | Navajo Nation Reservation | Coal Community Transition Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue increase (decrease) |  |  |  |  |  |  |  | (4,800) |  |  |  |  |  |  |  |  |  |
Recommended return on equity, percentage |  |  |  | 8.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded by shareholders |  |  |  |  |  |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |
Disallowance of plant investments |  |  |  |  |  |  | $ 215,500 |  |  |  |  |  |  |  |  |  |  |
Requested reversal of rate adjustment |  |  |  | $ 215,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost revenue recovery |  |  |  | $ 59,600 |  |  |  |  |  |  | 6,400 |  |  |  |  |  |  |
Lost revenue recovery collected |  |  |  |  |  |  |  |  |  |  | $ 6,400 |  |  |  |  |  |  |
Residential Utility Consumer Office | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84,900 |  |  |  |
Recommended return on equity, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.20% |  |  |  |
Increment of fair value rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |
Alternate recommended return on equity percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.087 |  |  |  |
Minimum | ACC | APS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual increase in retail base rates |  |  |  |  | $ 460,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increment of fair value rate, percentage |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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